custom fields on devices and ports in the web from config (#945)

* custom device field web display and edit

* make display work; relies on T::T calling dict slot or method with same syntax

* add storing port custom fields

* use resultset method instead, use cf_ prefix

* update Pg min ver for jsonb

* allow override of position and default for port custom fields

* support hidden for custom fields

* update description of Objects API class

* allow left and mid position for custom fields

* add custom fields in csv

* change port control sidebar label

* fix default missing bug on backend jobs

share/config.yml

@@ -112,7 +112,7 @@ sidebar_defaults:
   search_device:
     matchall:    { default: checked }
   device_ports:
-    c_admin:       { label: 'Port Controls', default: null, idx: 0 }
+    c_admin:       { label: 'Port Control and Editing', default: null, idx: 0 }
     c_port:        { label: 'Port', default: checked, idx: 1 }
     c_descr:       { label: 'Description', default: null, idx: 2 }
     c_comment:     { label: 'Last Comment', default: null, idx: 3 }
@@ -275,6 +275,9 @@ community_rw: []
 device_auth: []
 use_legacy_rancidexport: false
 use_legacy_sshcollector: false
+custom_fields:
+  device: []
+  device_port: []
 get_credentials: ""
 bulkwalk_off: false
 bulkwalk_no: []